You know how America’s cuisine comes from just about everywhere, and then they Americanize it?
Chicago is famous for a few things, but particularly meat. I think the meat packing industry was big there? Anyway, deep dish pizza is a Chicago thing, and “Vienna hot dogs” are another Chicago thing.
So some fun facts. A lot of the stereotypical American foods are actually often German.
Hot dogs are also called wieners, which makes a lot of children giggle. But “Wien” is the German name for Vienna, and all over the German speaking world there are sausages named after cities or regions where they’re specialized.
Therefore a “Wiener” is a sausage in the Vienna style, or more specifically it’d be called a Wienerwurst.
Since Wurst is the word for sausage, that’s why “Wiener Schnitzel” doesn’t actually involve sausages at all. It’s a schnitzel in the Vienna style.
Americanization takes the emphasis in a weird way. Bratwurst is a white sausage that’s made for frying, or “braten” which is the verb for frying. But in America, the colloquial name is “Brat.” So Americans will ask if you want a Brat, not a Wurst, which makes sense in America but sounds very weird if you know German.
The more you know.